You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
353 regels
12 KiB
353 regels
12 KiB
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file. See the AUTHORS file for names of contributors.
|
|
|
|
#include <sys/resource.h>
|
|
#include <sys/wait.h>
|
|
#include <unistd.h>
|
|
|
|
#include <cstdio>
|
|
#include <cstdlib>
|
|
#include <cstring>
|
|
#include <string>
|
|
#include <unordered_set>
|
|
#include <vector>
|
|
|
|
#include "gtest/gtest.h"
|
|
#include "leveldb/env.h"
|
|
#include "port/port.h"
|
|
#include "util/env_posix_test_helper.h"
|
|
#include "util/testutil.h"
|
|
|
|
#if HAVE_O_CLOEXEC
|
|
|
|
namespace {
|
|
|
|
// Exit codes for the helper process spawned by TestCloseOnExec* tests.
|
|
// Useful for debugging test failures.
|
|
constexpr int kTextCloseOnExecHelperExecFailedCode = 61;
|
|
constexpr int kTextCloseOnExecHelperDup2FailedCode = 62;
|
|
constexpr int kTextCloseOnExecHelperFoundOpenFdCode = 63;
|
|
|
|
// Global set by main() and read in TestCloseOnExec.
|
|
//
|
|
// The argv[0] value is stored in a std::vector instead of a std::string because
|
|
// std::string does not return a mutable pointer to its buffer until C++17.
|
|
//
|
|
// The vector stores the string pointed to by argv[0], plus the trailing null.
|
|
std::vector<char>* GetArgvZero() {
|
|
static std::vector<char> program_name;
|
|
return &program_name;
|
|
}
|
|
|
|
// Command-line switch used to run this test as the CloseOnExecSwitch helper.
|
|
static const char kTestCloseOnExecSwitch[] = "--test-close-on-exec-helper";
|
|
|
|
// Executed in a separate process by TestCloseOnExec* tests.
|
|
//
|
|
// main() delegates to this function when the test executable is launched with
|
|
// a special command-line switch. TestCloseOnExec* tests fork()+exec() the test
|
|
// executable and pass the special command-line switch.
|
|
//
|
|
|
|
// main() delegates to this function when the test executable is launched with
|
|
// a special command-line switch. TestCloseOnExec* tests fork()+exec() the test
|
|
// executable and pass the special command-line switch.
|
|
//
|
|
// When main() delegates to this function, the process probes whether a given
|
|
// file descriptor is open, and communicates the result via its exit code.
|
|
int TestCloseOnExecHelperMain(char* pid_arg) {
|
|
int fd = std::atoi(pid_arg);
|
|
// When given the same file descriptor twice, dup2() returns -1 if the
|
|
// file descriptor is closed, or the given file descriptor if it is open.
|
|
if (::dup2(fd, fd) == fd) {
|
|
std::fprintf(stderr, "Unexpected open fd %d\n", fd);
|
|
return kTextCloseOnExecHelperFoundOpenFdCode;
|
|
}
|
|
// Double-check that dup2() is saying the file descriptor is closed.
|
|
if (errno != EBADF) {
|
|
std::fprintf(stderr, "Unexpected errno after calling dup2 on fd %d: %s\n",
|
|
fd, std::strerror(errno));
|
|
return kTextCloseOnExecHelperDup2FailedCode;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
// File descriptors are small non-negative integers.
|
|
//
|
|
// Returns void so the implementation can use ASSERT_EQ.
|
|
void GetMaxFileDescriptor(int* result_fd) {
|
|
// Get the maximum file descriptor number.
|
|
::rlimit fd_rlimit;
|
|
ASSERT_EQ(0, ::getrlimit(RLIMIT_NOFILE, &fd_rlimit));
|
|
*result_fd = fd_rlimit.rlim_cur;
|
|
}
|
|
|
|
// Iterates through all possible FDs and returns the currently open ones.
|
|
//
|
|
// Returns void so the implementation can use ASSERT_EQ.
|
|
void GetOpenFileDescriptors(std::unordered_set<int>* open_fds) {
|
|
int max_fd = 0;
|
|
GetMaxFileDescriptor(&max_fd);
|
|
|
|
for (int fd = 0; fd < max_fd; ++fd) {
|
|
if (::dup2(fd, fd) != fd) {
|
|
// When given the same file descriptor twice, dup2() returns -1 if the
|
|
// file descriptor is closed, or the given file descriptor if it is open.
|
|
//
|
|
// Double-check that dup2() is saying the fd is closed.
|
|
ASSERT_EQ(EBADF, errno)
|
|
<< "dup2() should set errno to EBADF on closed file descriptors";
|
|
continue;
|
|
}
|
|
open_fds->insert(fd);
|
|
}
|
|
}
|
|
|
|
// Finds an FD open since a previous call to GetOpenFileDescriptors().
|
|
//
|
|
// |baseline_open_fds| is the result of a previous GetOpenFileDescriptors()
|
|
// call. Assumes that exactly one FD was opened since that call.
|
|
//
|
|
// Returns void so the implementation can use ASSERT_EQ.
|
|
void GetNewlyOpenedFileDescriptor(
|
|
const std::unordered_set<int>& baseline_open_fds, int* result_fd) {
|
|
std::unordered_set<int> open_fds;
|
|
GetOpenFileDescriptors(&open_fds);
|
|
for (int fd : baseline_open_fds) {
|
|
ASSERT_EQ(1, open_fds.count(fd))
|
|
<< "Previously opened file descriptor was closed during test setup";
|
|
open_fds.erase(fd);
|
|
}
|
|
ASSERT_EQ(1, open_fds.size())
|
|
<< "Expected exactly one newly opened file descriptor during test setup";
|
|
*result_fd = *open_fds.begin();
|
|
}
|
|
|
|
// Check that a fork()+exec()-ed child process does not have an extra open FD.
|
|
void CheckCloseOnExecDoesNotLeakFDs(
|
|
const std::unordered_set<int>& baseline_open_fds) {
|
|
// Prepare the argument list for the child process.
|
|
// execv() wants mutable buffers.
|
|
char switch_buffer[sizeof(kTestCloseOnExecSwitch)];
|
|
std::memcpy(switch_buffer, kTestCloseOnExecSwitch,
|
|
sizeof(kTestCloseOnExecSwitch));
|
|
|
|
int probed_fd;
|
|
GetNewlyOpenedFileDescriptor(baseline_open_fds, &probed_fd);
|
|
std::string fd_string = std::to_string(probed_fd);
|
|
std::vector<char> fd_buffer(fd_string.begin(), fd_string.end());
|
|
fd_buffer.emplace_back('\0');
|
|
|
|
// The helper process is launched with the command below.
|
|
// env_posix_tests --test-close-on-exec-helper 3
|
|
char* child_argv[] = {GetArgvZero()->data(), switch_buffer, fd_buffer.data(),
|
|
nullptr};
|
|
|
|
constexpr int kForkInChildProcessReturnValue = 0;
|
|
int child_pid = fork();
|
|
if (child_pid == kForkInChildProcessReturnValue) {
|
|
::execv(child_argv[0], child_argv);
|
|
std::fprintf(stderr, "Error spawning child process: %s\n", strerror(errno));
|
|
std::exit(kTextCloseOnExecHelperExecFailedCode);
|
|
}
|
|
|
|
int child_status = 0;
|
|
ASSERT_EQ(child_pid, ::waitpid(child_pid, &child_status, 0));
|
|
ASSERT_TRUE(WIFEXITED(child_status))
|
|
<< "The helper process did not exit with an exit code";
|
|
ASSERT_EQ(0, WEXITSTATUS(child_status))
|
|
<< "The helper process encountered an error";
|
|
}
|
|
|
|
} // namespace
|
|
|
|
#endif // HAVE_O_CLOEXEC
|
|
|
|
namespace leveldb {
|
|
|
|
static const int kReadOnlyFileLimit = 4;
|
|
static const int kMMapLimit = 4;
|
|
|
|
class EnvPosixTest : public testing::Test {
|
|
public:
|
|
static void SetFileLimits(int read_only_file_limit, int mmap_limit) {
|
|
EnvPosixTestHelper::SetReadOnlyFDLimit(read_only_file_limit);
|
|
EnvPosixTestHelper::SetReadOnlyMMapLimit(mmap_limit);
|
|
}
|
|
|
|
EnvPosixTest() : env_(Env::Default()) {}
|
|
|
|
Env* env_;
|
|
};
|
|
|
|
TEST_F(EnvPosixTest, TestOpenOnRead) {
|
|
// Write some test data to a single file that will be opened |n| times.
|
|
std::string test_dir;
|
|
ASSERT_LEVELDB_OK(env_->GetTestDirectory(&test_dir));
|
|
std::string test_file = test_dir + "/open_on_read.txt";
|
|
|
|
FILE* f = std::fopen(test_file.c_str(), "we");
|
|
ASSERT_TRUE(f != nullptr);
|
|
const char kFileData[] = "abcdefghijklmnopqrstuvwxyz";
|
|
fputs(kFileData, f);
|
|
std::fclose(f);
|
|
|
|
// Open test file some number above the sum of the two limits to force
|
|
// open-on-read behavior of POSIX Env leveldb::RandomAccessFile.
|
|
const int kNumFiles = kReadOnlyFileLimit + kMMapLimit + 5;
|
|
leveldb::RandomAccessFile* files[kNumFiles] = {0};
|
|
for (int i = 0; i < kNumFiles; i++) {
|
|
ASSERT_LEVELDB_OK(env_->NewRandomAccessFile(test_file, &files[i]));
|
|
}
|
|
char scratch;
|
|
Slice read_result;
|
|
for (int i = 0; i < kNumFiles; i++) {
|
|
ASSERT_LEVELDB_OK(files[i]->Read(i, 1, &read_result, &scratch));
|
|
ASSERT_EQ(kFileData[i], read_result[0]);
|
|
}
|
|
for (int i = 0; i < kNumFiles; i++) {
|
|
delete files[i];
|
|
}
|
|
ASSERT_LEVELDB_OK(env_->RemoveFile(test_file));
|
|
}
|
|
|
|
#if HAVE_O_CLOEXEC
|
|
|
|
TEST_F(EnvPosixTest, TestCloseOnExecSequentialFile) {
|
|
std::unordered_set<int> open_fds;
|
|
GetOpenFileDescriptors(&open_fds);
|
|
|
|
std::string test_dir;
|
|
ASSERT_LEVELDB_OK(env_->GetTestDirectory(&test_dir));
|
|
std::string file_path = test_dir + "/close_on_exec_sequential.txt";
|
|
ASSERT_LEVELDB_OK(WriteStringToFile(env_, "0123456789", file_path));
|
|
|
|
leveldb::SequentialFile* file = nullptr;
|
|
ASSERT_LEVELDB_OK(env_->NewSequentialFile(file_path, &file));
|
|
CheckCloseOnExecDoesNotLeakFDs(open_fds);
|
|
delete file;
|
|
|
|
ASSERT_LEVELDB_OK(env_->RemoveFile(file_path));
|
|
}
|
|
|
|
TEST_F(EnvPosixTest, TestCloseOnExecRandomAccessFile) {
|
|
std::unordered_set<int> open_fds;
|
|
GetOpenFileDescriptors(&open_fds);
|
|
|
|
std::string test_dir;
|
|
ASSERT_LEVELDB_OK(env_->GetTestDirectory(&test_dir));
|
|
std::string file_path = test_dir + "/close_on_exec_random_access.txt";
|
|
ASSERT_LEVELDB_OK(WriteStringToFile(env_, "0123456789", file_path));
|
|
|
|
// Exhaust the RandomAccessFile mmap limit. This way, the test
|
|
// RandomAccessFile instance below is backed by a file descriptor, not by an
|
|
// mmap region.
|
|
leveldb::RandomAccessFile* mmapped_files[kReadOnlyFileLimit] = {nullptr};
|
|
for (int i = 0; i < kReadOnlyFileLimit; i++) {
|
|
ASSERT_LEVELDB_OK(env_->NewRandomAccessFile(file_path, &mmapped_files[i]));
|
|
}
|
|
|
|
leveldb::RandomAccessFile* file = nullptr;
|
|
ASSERT_LEVELDB_OK(env_->NewRandomAccessFile(file_path, &file));
|
|
CheckCloseOnExecDoesNotLeakFDs(open_fds);
|
|
delete file;
|
|
|
|
for (int i = 0; i < kReadOnlyFileLimit; i++) {
|
|
delete mmapped_files[i];
|
|
}
|
|
ASSERT_LEVELDB_OK(env_->RemoveFile(file_path));
|
|
}
|
|
|
|
TEST_F(EnvPosixTest, TestCloseOnExecWritableFile) {
|
|
std::unordered_set<int> open_fds;
|
|
GetOpenFileDescriptors(&open_fds);
|
|
|
|
std::string test_dir;
|
|
ASSERT_LEVELDB_OK(env_->GetTestDirectory(&test_dir));
|
|
std::string file_path = test_dir + "/close_on_exec_writable.txt";
|
|
ASSERT_LEVELDB_OK(WriteStringToFile(env_, "0123456789", file_path));
|
|
|
|
leveldb::WritableFile* file = nullptr;
|
|
ASSERT_LEVELDB_OK(env_->NewWritableFile(file_path, &file));
|
|
CheckCloseOnExecDoesNotLeakFDs(open_fds);
|
|
delete file;
|
|
|
|
ASSERT_LEVELDB_OK(env_->RemoveFile(file_path));
|
|
}
|
|
|
|
TEST_F(EnvPosixTest, TestCloseOnExecAppendableFile) {
|
|
std::unordered_set<int> open_fds;
|
|
GetOpenFileDescriptors(&open_fds);
|
|
|
|
std::string test_dir;
|
|
ASSERT_LEVELDB_OK(env_->GetTestDirectory(&test_dir));
|
|
std::string file_path = test_dir + "/close_on_exec_appendable.txt";
|
|
ASSERT_LEVELDB_OK(WriteStringToFile(env_, "0123456789", file_path));
|
|
|
|
leveldb::WritableFile* file = nullptr;
|
|
ASSERT_LEVELDB_OK(env_->NewAppendableFile(file_path, &file));
|
|
CheckCloseOnExecDoesNotLeakFDs(open_fds);
|
|
delete file;
|
|
|
|
ASSERT_LEVELDB_OK(env_->RemoveFile(file_path));
|
|
}
|
|
|
|
TEST_F(EnvPosixTest, TestCloseOnExecLockFile) {
|
|
std::unordered_set<int> open_fds;
|
|
GetOpenFileDescriptors(&open_fds);
|
|
|
|
std::string test_dir;
|
|
ASSERT_LEVELDB_OK(env_->GetTestDirectory(&test_dir));
|
|
std::string file_path = test_dir + "/close_on_exec_lock.txt";
|
|
ASSERT_LEVELDB_OK(WriteStringToFile(env_, "0123456789", file_path));
|
|
|
|
leveldb::FileLock* lock = nullptr;
|
|
ASSERT_LEVELDB_OK(env_->LockFile(file_path, &lock));
|
|
CheckCloseOnExecDoesNotLeakFDs(open_fds);
|
|
ASSERT_LEVELDB_OK(env_->UnlockFile(lock));
|
|
|
|
ASSERT_LEVELDB_OK(env_->RemoveFile(file_path));
|
|
}
|
|
|
|
TEST_F(EnvPosixTest, TestCloseOnExecLogger) {
|
|
std::unordered_set<int> open_fds;
|
|
GetOpenFileDescriptors(&open_fds);
|
|
|
|
std::string test_dir;
|
|
ASSERT_LEVELDB_OK(env_->GetTestDirectory(&test_dir));
|
|
std::string file_path = test_dir + "/close_on_exec_logger.txt";
|
|
ASSERT_LEVELDB_OK(WriteStringToFile(env_, "0123456789", file_path));
|
|
|
|
leveldb::Logger* file = nullptr;
|
|
ASSERT_LEVELDB_OK(env_->NewLogger(file_path, &file));
|
|
CheckCloseOnExecDoesNotLeakFDs(open_fds);
|
|
delete file;
|
|
|
|
ASSERT_LEVELDB_OK(env_->RemoveFile(file_path));
|
|
}
|
|
|
|
#endif // HAVE_O_CLOEXEC
|
|
|
|
} // namespace leveldb
|
|
|
|
int main(int argc, char** argv) {
|
|
#if HAVE_O_CLOEXEC
|
|
// Check if we're invoked as a helper program, or as the test suite.
|
|
for (int i = 1; i < argc; ++i) {
|
|
if (!std::strcmp(argv[i], kTestCloseOnExecSwitch)) {
|
|
return TestCloseOnExecHelperMain(argv[i + 1]);
|
|
}
|
|
}
|
|
|
|
// Save argv[0] early, because googletest may modify argv.
|
|
GetArgvZero()->assign(argv[0], argv[0] + std::strlen(argv[0]) + 1);
|
|
#endif // HAVE_O_CLOEXEC
|
|
|
|
// All tests currently run with the same read-only file limits.
|
|
leveldb::EnvPosixTest::SetFileLimits(leveldb::kReadOnlyFileLimit,
|
|
leveldb::kMMapLimit);
|
|
|
|
testing::InitGoogleTest(&argc, argv);
|
|
return RUN_ALL_TESTS();
|
|
}
|